The Centers for Disease Control and Prevention called it the first severe case in the U.S., though the risk to most of the public is still low.

Nearly a year into the first outbreak of the bird flu among cattle, the virus shows no sign of slowing, but an investigation finds ongoing missteps by federal authorities.

California officials have declared a state of emergency over the spread of bird flu, which is tearing through dairy cows in ...

FILE -This colorized electron microscope image released by the National Institute of Allergy and Infectious Diseases on March 26, 2024, shows avian influenza A H5N1 virus particles (yellow), grown ...

This is a powerful way for a virus to leapfrog towards causing a pandemic. However, it only works if a bird virus and a human virus can get into the same cell at the same time, and this turns out to ...